Monitors hum when plugged in to Mac Pro

When plugging my JBL monitors into the speaker port of my Mac Pro I “recently” began getting a hum and crackling. We have determined it is not the Monitors or Cable since this does not happen in another mac here at home. Is the port fixable???

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Can you give us a bit more on which of the many Mac's Apple has produced!

Plug in your systems S/N here EveryMac - Lookup let us know what you have.

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I think this is what you are asking for... Cylinder Mac Pro Q&A

Cylinder, A1481

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@amsterdamnl - Thats great!

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